Bayer Aktiengesellschaft

Erdolchemie Gmbh

Feliks Bitners

Helmut Fiege

Karlfried Wedemeyer

Josef Haydn

Dieter W Bruck

Adolf Wissner

Raimund Wambach

Johann Renner

Werner Hauser

Adolf Mayer

Arnold Hausweiler

A process for separating ortho-, meta-, and/or para-dichlorobenzene from an isomeric mixture thereof which comprises:

Process for the preparation of dichlorobenzenes

A process for the tertiary dealkylation of a tertiary alkyl containing m- and/or p-cresol wherein a tertiary alkyl containing m- and/or p-cresol is continously introduced into a reaction vessel with a small amount of sulfuric acid or an quivalent amount of a sulfonic acid and the reaction vessel contains a high concentration of m- and/or p-cresol or a high boiling phenol which under the prevailing reaction conditions is not substantially vaporized from the reaction mixture. The reaction mixture is maintained at a temperature of no greater than 230.degree. C. The reaction products are withdrawn continuously from the reactor (and separated into its components) and at the same time a small amount of the reaction mixture being withdrawn intermittently or continously from the reactor.

Process for the dealkylation of tert.-alkyl substituted phenols

Waste water resulting from the production of acrylonitrile by gas phase oxidation of propylene and ammonia with oxygen as washing water in the recovery section is purified by treating the waste water with 0.4 to 1 ton of steam per ton of waste water in a detoxification column attached to or following the separation column (for the separation of acetonitrile and acrylonitrile from the waste water in the acrylonitrile process) at a temperature from 100.degree. to 125.degree. C, at a pressure of 0 to 2 (gauge) atmospheres; separating the non-volatile resinous organic compounds from the thus treated waste water in an evaporator and using the vapors from the top of said evaporator to heat the said separation column and detoxification column; and optionally adding an organic amine to said distillation column or to said evaporator.

Process for the purification of waste from acrylonitrile production

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Leverkusen, Germany

Feliks Bitners